Stapling machine



S. H. HUNT STAPLING MACHINE July 4, 1933.

Filed May 28. 1931 swam H201,

Ting rod 18.

l I cylinde'r l-mounted rigidly Withinth e pedes-w "messag ng 4, 19 3 VA 1 It The object bf? toprovide 1 afiuid pfessurei' (preferablytair)mechanism.'

f mp ingl o he S ap er-bef s actuating fl id foriperforming this" o eates-beings enable*thelfstitches.orstapling operations'toz befm'adequicker and" With less? eflort Jon -the s partfof the o-peratorl andalso "toffenable* the power. of thestapling stroke'zjtoibereadily=regulated 'as more fully-hereinafter set-forth.

"In'thedrawingannexedz" 'F'g. 1 is a verticalwsectional View offa 'Wellknown form'fof stapling machine ha/V?- my inventionapplied thereto andectional viewjenla'rg'ed 'l ig. 2 is a vertical s of thefluid pressuremechanism. 3-

v R rr n o t edm ifis an x d br fe: 'e'rence characters fi designatesthe usual holg low verticalpedestaljof the machinein which I d r0 r pr cte vert e f n QdLifi s :attachedtoits upp'er'end a lateralarm Tear-'1ryi ngtthe usualiyertical jstapler or stitch-' i The lower end ofthepiston rod Ghasattached' to it a solid piston 9 working. in a ,tal,'itslowerwend being-open and itsfupper endbein'g closedQEnteringthecylinder, at,

'a point above the piston isa port towhich is connected a pipe ,11 whichpasses; through" a i hole in thelpedestalzand is connected at itsoutere'nd to a tubularvalve cylinder 12. In

this tubular al ve'cylinder isarranged a dou-., 35' ble piston valve '13which is normally pressedfl into inoperative position by means'iofaspira'l expansive spring 14 arranged bet-ween one of the pistons ofthevvalvean'd the adjacent head r of the cylinder Connected to thecylinbe connected to any i source "of" expansible 7 fluidunder'pressure, airbeing the most'de "sirable fluid. vEXtending outthrough) the other head of the valve cylinder 12 is a'rod 17 .2,Withthi's construction it Will be observed ,7 that whenthe doublepiston-'yalve ism. its lower point; Where it is kept normally by thespring ll, no air can enter the cylinder 10,,

'50 but when the double piston' is actuated by.

jder 12iat a. point between"thertwo valve pis tons is an inlet'pipel5jwhich is intended to 16 Which'is connected to an; operating pedal'jsrnvns rnnn nitride,'o'F nanionic,yrminq'u pipeffl'5 '}V'vill? havefree access 1 to lthe and moves, his foot, fromijth e'pedal the spring14:

expandsand t-hus'closesthe valve; shutting g i through"a'port oifflportsl8'formed in Q, gthevalvecylinder m' When the 'pressure'intthe cylinderis 'thus'relie-Ved'the piston rod 'andst'apler rod iqyve'r' eapseaaaagain'st tin-abutmen 20 1 the inte against an the on workingstroke is formed entirely an] ex- V i've fluid andthat-therefore{varying ']'the power of the stroke: tofsuitthe conditionsi and nature ofithefworkin hand. tThisfluid' -Z mechanism alsoena'blesthe Working stroke tojbe made quick-er and further there is a6 5 deirable resilienceinthe Work ofeutting'and I shaping'anddrivingthestaple.'Also'the ers I o fort on the part ofthefo'perator is-reduced to" r aminimum, his effortbeing confined. entirely a to the lpressingi of asmall. light spring314. It.

will beobseryedj further that my mechanism lends itself 'n-i'cely tocompactness; which is'fifi V desirablenot onlyfforshipping purposes butfor the-saving of space in the shopythis compa'ctn-ess beingidue' to thefact that-both th operating cylinder and the'lifting spring are mountedin'theusual hollow pedestal f th 'e @The'upper closedend of thecylinderslo is,

rigidly but reinov ably fastened Within the y pedestal by means ofIa-plurality of machine 5 bolts 22 whichzpass throughlioles formedsin'95 the pedestal Wall and tapped'intothe head of" v thecylinder theouterWall of the head of the i cylinder being'tapered to lfit solidlyagainst? r the; inner face, bfjthefiwjall of-the pedesta1. I To increasethesolidarityj of this anchorage 0 Q j .:tlieactionspriiigl lfthe I i wil h s ome" owe pi "to'n j'9 and-cause-an'operation oflthei'stapling.

When'thegopferator 're lifeansfof,an expansible coilfs pring fifix s519h'oused'inithe pedestal band having its 1 i ,v

"iorlbiitliefpedestalfandits upp-erend I in the pedestal I preferpouring into the an nular space between the cylinder and the pedestal aBabbitt metal filling 23 which adheres to the cylinder and to thepedestal wall and thus assists materially in centering the cyle inderwithin the pedestal. I prefer providing the head of the cylinder with aseparable head 24: which is screwed down into the cylinder and carries apiston-packing 25. To keep this packing 25 tight I tap into theunderside of the head 24: a gland 26, and I utilize this gland 26- as astop for limiting the upward movement of the piston 9 under theinfluence I of the return spring 19. This arrangement is desirablebecause by housing the cylinder within the pedestal it would beimpossible to get at the gland 26 for adjustment purposes withoutremoving the cylinder from the pedestal or making a hole in thepedestal, whereas with my arrangement'I can readily get access to thegland 26 and also to the rings of the piston by simply disconnecting thefastening nut of the piston and slipping the piston I downwardly out ofthe cylinder.

In accordance with the provisions of the patent statutes, I have hereindescribed the principle of operation of my-invention, together with theapparatus which I now consider to represent the best embodimentsthereof, but I desire to have it understood that the apparatus disclosedis only illustrative and that the invention canbe carried out by othermeans. Also, while it is designed to use the Various features andelenientsin the combinations and relations described, some of these maybe altered and others omitted and some of the features of eachmodification may be embodied in the others without interfering with themore general results outlined, and the invention extends tosuch use.

I claim: 1. In a stapling machine embodying a hollow pedestal, avertical piston rod for operating the stapler, a piston on the lower endof" 1 said rod, a cylinder for this piston, and valve means foradmitting andexhausting an eX- pansive fluid into and out of thecylinder at a point above the piston to thereby perform the workingstroke under the action of an expansive fluid, and spring means forreturning the rod of the stapler preparatory to another working stroke,said cylinder being housed and centered within said hollow pedestal atthe lower end thereof and having its top closed and its bottom open. I

2. In a staplinginachinda hollow pedestal, a piston rod extending upthrough said hollow pedestal and having connected to its upper end thestapling device operable upon the down stroke of said piston rod, areturn spring housed within said pedestal, an actuating cylinder housedwithin the pedestal at a point below the spring and rigidly butremovably fastened to the inner face of the wall of the pedestal, apiston attached to said piston rod and working in said cylinder, saidcylinder having an open lower end and a closed upper end, the closedupper end being provided with a removable packing-carrying 1";

member and also an adjustable gland for said packing, this glandbeing'arranged in the upward path of the piston. so as to serve as astop for the upward, return stroke thereof.

In testimony whereof .I hereunto affix my signature.

SYLVESTER H. HUNT.

